Property Income & Section 24: what you'll actually keep after tax

Most landlord calculators show the yield. The Property Income & Section 24 dashboard shows the number that really matters — what you keep after tax once Section 24 has done its work.

Section 24 quietly reshaped landlord economics. Instead of deducting mortgage interest as a cost, individual landlords now add it back to their taxable profit and receive only a flat 20% credit. For a higher-rate taxpayer that means paying tax on income you never truly earned — and from 6 April 2027 the rate on that rental slice rises to 42%.

The Property Income & Section 24 dashboard takes your rent, allowable expenses and mortgage interest and shows the tax you actually pay, side by side with the old pre-2017 rules and a Ltd Co comparison. You can toggle between the 2026/27 and 2027/28 tax years to see exactly how the 2027 rise hits you.

It also lays out the SA105 self-assessment boxes and flags when Making Tax Digital (mandatory for £30,000+ gross income from April 2027) will apply to you — so the numbers you read are the numbers you file.

Who it's for: any individual landlord with a mortgage who wants a clear, honest answer to "is this still worth it after tax?" rather than a yield figure that ignores the biggest cost of all.

Educational guidance only — not financial, tax or legal advice. Tax and property rules change; always verify current figures on GOV.UK and take professional advice before acting. © 2026 Property Clues.